JPH10210530A - Radio packet access method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the random access method of radio packet communication in which deterioration in a transmission efficiency of the entire communication is prevented even when a traffic amount is increased. SOLUTION: When an incoming radio packet channel is used by other mobile equipment 4, in the case that re-transmission of a frame or confirmation of a reply is requested by a specific mobile equipment from a base station controller 2, a radio base station 3 sets a newly provided limit state in addition to an idle/busy state to a collision control bit field of an outgoing radio packet channel to permit transmission to the specific mobile equipment 4. Thus, a data terminal 5 connecting to the mobile equipment 4 is available of transmission to the base station controller 2. Furthermore, a mobile equipment 4 whose transmission is permitted with priority is designated to a (PS-ID) field to indicate a kind of the frame able to be transmitted with priority so as to improve the transmission efficiency in a data link (layer 2) layer being a high-order layer of a radio interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a plurality of mobile stations constituting a mobile communication system share a single radio channel with a radio base station and perform multi-channel access type radio packet communication. ARQ (Auto Repeat reQ) for performing error control in an upper layer of the wireless access layer in response to an error occurring in the wireless section.
The present invention relates to a wireless packet access method aimed at improving the throughput when performing data link control using west).

[0002]

2. Description of the Related Art As a conventional example relating to a random access method of wireless packet communication, there is a technical report RCS91-30.
There is a method described in "Airline Control Mobile Communication Random Access with Partial Echo (ICMA-PE)" p7 to p9. Next, a description will be given of the above-mentioned "line control mobile communication random access system with partial echo (ICMA-PE)".

In the empty line control method, "empty / occupied" of an uplink channel is represented by using an "empty line / prohibit" bit, and the collision detection type uses a collision detection indication bit to perform non-reception due to signal collision. Represents To stop transmission from mobile units other than signals that survived by the capture effect at the time of signal collision in order to increase the transmission efficiency of uplink signals, make sure that the transmission signal generated by the mobile unit itself has been received by the radio base station. It is necessary to determine whether or not to continue or stop transmission according to the result. In this case, for the determination by the mobile device itself, there may be a method of transmitting the entire uplink signal received by the radio base station as it is as a downlink signal and transmitting it to the mobile device as it is, but in these methods, transmission of the original downlink signal is considered. The transmission efficiency is reduced due to pressure.

[0004] Here, "uplink" indicates a direction from the mobile station to the radio base station, and "downlink" indicates a direction from the radio base station to the mobile station. In addition, ICMA-PE (Idle Sig
nal Casting Multiple Access
In the method using ss-Partial Echo),
The radio base station is "absence / prohibition", "reception / non-reception"
In addition to the information, a signal that has been subjected to a certain processing to a signal received from the mobile device is subjected to partial echo (Partial Echo).
The most characteristic feature is that the transmission is transmitted back to the mobile device, and the mobile device autonomously determines the success or failure of transmission of the signal transmitted by itself and controls the transmission.

In this case, the radio base station reflects as much as possible the content of the transmission signal from the mobile station as a partial echo,
By using a different short bit sequence from a plurality of mobile devices, while securing the transmission capacity of the downlink signal, even at the time of uplink signal collision, to stop the transmission of the mobile device that has transmitted the non-received signal, Only the mobile station from which the signal was received can continue transmission.

FIG. 21 shows a format of a downlink signal in communication by ICMA-PE. An "empty line / inhibit" signal (hereinafter sometimes referred to as I / B) for each slot.
le, B: Busy), "reception / non-reception" (hereinafter R / N
R: Receive, N: Not
receive, and a collision control bit composed of a partial echo (hereinafter also referred to as PE: Partial Echo). CRC as partial echo
(Cyclic Redundancy Check)
Check bits and the like can be used.

FIG. 22 shows a format of an upstream signal in communication by ICMA-PE. W indicating information on the message length for each burst, that is, information for notifying the radio base station of the number of slots to be transmitted after the next slot is added. The radio base station uses this information W to determine the I / B of the collision control bit portion of the next slot.

[0008] TDMA (Time Division)
In the Multiple Access) application,
Data is divided into slot length units, and if an error detection check bit or a CRC check bit is added to an information signal for each slot length, "reception / non-reception" and determination of partial echo can be determined for each slot timing. Therefore, transmission control closed to layer 1 can be performed, which is suitable for hierarchical transmission control.

FIG. 23 is a flowchart showing the operation of the radio base station in communication by ICMA-PE. When no signal is received from a mobile station, the radio base station sets I / B to I, R / N to N, sets an all-zero bit pattern to PE, and sets all the mobile stations in the next slot. Allow sending of. When a signal from the mobile station is received, the radio base station sets R / N to R, and outputs a result of performing a certain process on the received data to P / N.
Set to E. At this time, I / B is set according to the message configuration information W. That is, the bit pattern of I is set if the received data is the last frame, and the bit pattern of B is set if the received data is continued.

[0010] In this way, the radio base station has the I / B, R
After setting / N and PE, they are transmitted as collision control bits together with downlink information. When the signal from the mobile device is not received, the radio base station sets N for R / N and I for B / I.
Is set to stop transmission of the mobile device, and new transmission of all mobile devices in the next slot is permitted.

FIG. 24 is a flowchart showing the operation of the mobile station in communication by ICMA-PE. Next, the operation of the mobile device will be described with reference to FIG. The transmission timing is slotted in synchronization with the reception signal. That is, the mobile station that has generated the transmission data starts transmitting data at the transmission timing immediately after the I / B receives I (transmission permission). R / R of the collision control bit of the next downlink slot
If N is R (normal reception) and PE matches the data transmitted from the mobile station after performing a certain process, the mobile station regards that the transmission of the first frame of the data is successful,
If the data continues, the transmission is continued, and if the data consists of only one frame, the transmission is completed. R / N is R
(Normal reception) even if the PEs do not match, or R /
When N is N (non-reception), the mobile station performs retransmission (also called recycle) after a random delay. If the number of retransmissions exceeds a predetermined value, the mobile station determines that transmission has failed.

FIG. 25 shows an example of a signal transmission time chart between the radio base station and the mobile station. For simplicity of explanation, it is assumed here that the radio base station transmits the first character of the received signal as a partial echo. Mobile device 1
For example, when the mobile station 2 generates data (2hij) at the same time as generating data (1ABC), the radio base station transmits a bit pattern indicating that the I / B part of the collision control bit indicates I (transmission permission). Therefore, when this signal is received, the mobile stations 1 and 2 transmit the above-mentioned signal at the same time, so that a signal collision occurs.

The data transmitted from the mobile device 2 (2hi
j) is received by the radio base station and the data (1ABC) transmitted from the mobile station 1 is not received by the radio base station, the mobile station 2 transmits the collision control bits (B, B) from the radio base station.
R, 2) (where B indicates prohibited, R indicates normal reception completed, 2 indicates mobile station 2. The radio base station is normally receiving data from mobile station 2, and during this reception, other radio stations are receiving data. This means that transmission from the mobile station is prohibited.), The transmission data of the own station is received, and the subsequent data (klmn) is transmitted.

On the other hand, the mobile station 1 receives the collision control bits (B, R, 2) from the radio base station, thereby knowing that the transmission signal of its own station has not been received, suspending the transmission and waiting for retransmission. become. The mobile station 2 transmits the next collision control bit (I, R,
By receiving k), it is known that the data (klmn) has been received, and the transmission is completed. On the other hand, the mobile device 1 performs retransmission after the transmission of the mobile device 2 is completed.

[0015]

SUMMARY OF THE INVENTION In digital communication,
Generally, layer 1 (physical layer), layer 2 (link layer),
Layer control such as layer 3 (protocol layer) is performed. Layer 2 (HDLC (High level)
Data Link Control) procedure, for example, L
APD (Link Access Procedure)
on the D-channel), LAPB (Li
nk Access Procedure-Balan
ced), etc.), transmission confirmation and error frame retransmission control are performed.

In the above conventional example, when the radio base station determines that the transmission slot from the mobile station is the last slot based on the information W on the message length of the transmission data from the mobile station, all radio stations from the next slot start. Release the upstream slot to the machine. When an error frame or an untransmitted frame is detected in layer 2 on the radio base station side with respect to transmission data from the mobile station, a retransmission request is made to the mobile station.

However, the downlink slot from the radio base station to the mobile station and the uplink slot from the mobile station to the radio base station are:
Since each of them is transmitted and received independently, when a situation in which the mobile station which is the target of the retransmission request from the radio base station cannot acquire the transmission right of the uplink slot occurs, a retransmission waiting timer related to layer 2 of the radio base station side Eventually, a timeout occurs, and the frame normally received until now is also discarded.

Also, when the mobile station sends a delivery confirmation as a response to the downlink frame transmitted from the radio base station to the mobile station, the transmission right of the uplink slot cannot be acquired.
After the timeout, the same frame is retransmitted from the wireless base station to the mobile device.

As described above, in the conventional random access method of wireless packet communication, measures are taken for the transmission efficiency in layer 1, but measures are taken for the transmission confirmation and retransmission control in layer 2. Therefore, when the traffic volume increases, there is a problem that the transmission efficiency of the entire communication is reduced even though no transmission error occurs in the layer 1.

The present invention has been made in order to solve such a problem, and provides a random access method for wireless packet communication that prevents a decrease in the transmission efficiency of the entire communication even when the traffic volume is large. The purpose is to:

[0021]

According to a first aspect of the present invention, there is provided a radio packet access method, comprising: a base station controller having a data transfer control and a route selection function in a radio communication network; A plurality of radio base stations for outputting a signal including a collision control bit field for controlling a state of a radio packet channel on a downlink radio channel, a multi-channel access format by establishing a radio communication link with the base station controller and the radio base station; Used in a mobile communication system including a plurality of mobile devices performing packet communication according to the present invention and a data terminal connected to the mobile device, wherein the base station control device transmits a data frame to any of the mobile devices. Thereafter, when expecting the delivery confirmation of the data frame, the radio base station controls the collision control bit field. It is to allow the transmission to only the mobile station that transmitted the data frame Te.

A wireless packet access method according to a second aspect of the present invention provides a base station controller having a data transfer control and a route selection function in a wireless communication network, and an uplink wireless packet channel controlled by the base station controller. A plurality of radio base stations for outputting a signal including a collision control bit field for controlling a state on a downlink radio channel; a packet communication in a multi-channel access format by establishing a radio communication link with the base station controller and the radio base station; Used in a mobile communication system including a plurality of mobile devices and a data terminal connected to the mobile device, wherein the base station controller detects an error in a data frame transmitted from the mobile device, When requesting retransmission of the frame, the radio base station controls the collision control bit field to perform retransmission. It is to allow the transmission to only the mobile station that needs.

Also, in the wireless packet access method according to the third invention, the wireless base station may be configured to transmit a request for acknowledgment to a specific mobile station or a request for retransmission of a frame in which an error has been detected from the base station controller. Transmitting the acknowledgment to the specific mobile station via a wireless channel, or permitting retransmission of a frame in which an error is detected, and receiving the acknowledgment or retransmission frame transmitted from the specific mobile station, the base station It relays to the control device.

Further, in the wireless packet access method according to the fourth invention, the mobile station is notified of a delivery confirmation request or a retransmission request for a frame in which an error has been detected from the base station controller via the wireless base station. In addition, a transmission confirmation frame or a frame requested to be retransmitted is transmitted in accordance with transmission confirmation or transmission permission of a frame in which an error is detected.

Also, in the wireless packet access method according to the fifth invention, the mobile station performs a handover during the communication of the data frame, and the base station controller requests the mobile station to which the handover has been performed to confirm delivery. Or when detecting an error in the received frame and requesting retransmission of the frame, the base station controller transmits a transmission confirmation to the mobile device from the handover destination radio base station or the frame. Is permitted.

In the radio packet access method according to a sixth aspect of the present invention, the collision control bit field of the downlink radio packet channel includes an identifier of the mobile station, and the radio base station transmits an acknowledgment request to a specific mobile station or retransmits the frame. When a request becomes necessary, the transmission right is given to only one specific mobile device by designating the identifier of the mobile device.

A wireless packet access method according to a seventh aspect of the present invention is a mobile station in a discontinuous reception mode in which the reception of a frame from a base station controller or the transmission of a frame to the base station controller is completed. In response to a delivery confirmation request, or when a request for retransmission of a frame in which an error is detected occurs, the radio base station adjusts the timing at which the mobile device is operating in intermittent reception, a delivery confirmation request to the mobile device, or A notification of a retransmission request for a frame in which the error has been detected is notified, and transmission of the acknowledgment or retransmission of the frame in which the error has been detected is permitted to the mobile station in accordance with the timing.

[0028] In a wireless packet access method according to an eighth aspect of the present invention, when the uplink radio channel is being used by another mobile station, the radio base station uses the other mobile station using the uplink radio channel. Suspends the use of the channel, and acknowledges the delivery of the mobile station targeted for the acknowledgment request or the retransmission request of the frame in which the error has been detected, or permits the transmission of the frame in which the error has been detected. After the transmission of the acknowledgment from the mobile device or after the retransmission of the frame in which the error is detected is completed, the transmission to the other mobile device that has stopped using the wireless channel is permitted.

The radio packet access method according to the ninth invention is characterized in that the radio base station has a plurality of radio packet channels and the radio base station is used when an uplink radio channel is used by another mobile station. The station notifies another mobile station that is a target of a delivery confirmation request or a retransmission request of a frame in which an error has been detected on the downlink radio channel of another unused uplink radio channel, and transmits the unused uplink radio channel. Transmission of an acknowledgment to the mobile device using a channel,
Alternatively, retransmission of a frame in which an error is detected is permitted.

[0030] In the radio packet access method according to the tenth aspect, the radio base station receiving the acknowledgment request transmitted from the base station control device or the retransmission request of the frame in which the error is detected may transmit the uplink radio channel. When all the mobile stations are in use, a frame indicating that frame reception is impossible (congestion state) is returned to the base station controller.

Further, in the radio packet access method according to the eleventh invention, when the uplink radio channel is used by another mobile station, the radio base station sets the radio channel according to the priority added to the mobile station. The transmission of the other mobile station being used is interrupted, transmission is permitted on the channel, transmission is permitted on another unused radio packet channel, or the base station control device cannot receive a frame ( (Congestion state).

Further, in the wireless packet access method according to the twelfth invention, the wireless base station sets the wireless packet channel to idle in response to a delivery confirmation request from the base station control device or a retransmission request for a frame in which an error is detected. If it is in the state, it instructs the mobile station to transmit a delivery confirmation frame or a retransmission request frame, permits transmission of data frames other than those requested to the mobile station and the data terminal, and sets the wireless packet channel to another If the mobile device is busy, transmission from another mobile device that is currently giving the transmission right is completed, and the mobile device attempts to transmit a delivery confirmation;
Alternatively, the base station control device notifies a transmission error and instructs a state (hereinafter referred to as a limit state) with a constraint condition that gives a transmission right only to a mobile station that is to retransmit a frame in which the error has occurred. It instructs the mobile station, to which the transmission right has been given in the limit state, to transmit only a delivery confirmation frame or a retransmission request frame, and does not permit transmission even if there is a request for transmission of another data frame from the data terminal.

Also, in the wireless packet access method according to the thirteenth aspect, the wireless base station may receive the delivery confirmation request from the base station control device or the retransmission request of the frame in which the error has been detected. When the priority of the mobile station having the transmission right is higher or the same, the transmission of the acknowledgment frame or the retransmission request frame only is instructed, and the priority of the mobile station having the transmission right of the radio packet channel is given. Is lower, the mobile station and the data terminal are permitted to transmit a delivery confirmation frame or a retransmission request frame together with a data frame other than the requested frame.

Further, in the radio packet access method according to the fourteenth invention, when the mobile station intends to acquire the transmission right of the uplink radio packet channel in response to a data transmission request from the data terminal, And a random delay or a fixed delay with an upper limit of a value according to the type of frame transmitted in the uplink wireless packet channel.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a system configuration diagram showing one embodiment of a wireless packet access method according to the present invention.
In FIG. 1, reference numeral 1 denotes a LAN (Local Area N).
network, a base station controller 2 for controlling a plurality of wireless base stations and controlling the transmission and reception of data between the LAN 1 and the mobile device, and 3 for transmission control of the plurality of mobile devices which are wirelessly connected to the mobile device. The wireless base station 4 performs the data transmission from the data terminal to the wireless base station 3 by radio, and
A mobile device that transmits data transmitted from a data terminal to a data terminal;
Reference numeral 5 denotes a data terminal connected to the mobile device 4, and reference numeral 6 denotes an existing data terminal connected to the LAN 1.

FIG. 2 shows the MAC of the mobile unit 4 shown in FIG.
(Media Access Control) and a frame (hereinafter, referred to as a MAC frame) wirelessly transmitted and received between the MAC of the wireless base station 3 and the LLC of the data terminal 5.
(Logical Link Control) and a frame (hereinafter LL) transmitted and received by the LLC of the base station controller 2.
FIG. 7 is an explanatory diagram showing an example of format conversion when conversion to a C frame) or its inverse conversion is performed in the wireless base station 3.

FIG. 3 is an explanatory diagram showing an example of format conversion of a MAC frame and an LLC frame performed in the mobile station 4 shown in FIG.

FIG. 4 shows an upstream MAC frame and a downstream MA transmitted and received between the radio base station 3 and the mobile station 4.
FIG. 4 is a MAC frame structure diagram showing a structure of a C frame.

FIG. 5 is a structural diagram showing an example of the collision control bit field shown in FIG. 4 when the radio base station 3 notifies a plurality of mobile stations 4 of the state of the uplink radio packet channel. In FIG. 5, USP (Up Slot In)
formation is an idle state indicating that all mobile stations 4 can transmit the uplink channel, and a busy state indicating that one mobile station is using the uplink channel and the other mobile stations are prohibited from using it. , There is a limit state indicating that the uplink channel can be used under the constraint.

Also, Receive / Not receive
The “live” state is information indicating whether or not the wireless base station 3 has normally received data from the mobile device 4.
Indicates that the wireless base station 3 has successfully received data from the mobile device 4, and Not receive indicates that the wireless base station 3
Indicates that data from the mobile device 4 could not be received.

FIG. 6 shows mobile units 4a and 4b (terminal 5).
a and 5b), and an operation sequence between the radio base station 3 and the base station control device 2. FIG.
, Mobile device 4 (terminal 5) a, mobile device 4 (terminal 5)
b, the signal between the LLC and the MAC, and the M of the radio base station 3
The signal between the AC and the LLC of the base station controller 2 is a signal used in the layer 2 HDLC procedure signal. Also,
The signal between the radio base station 3 and the mobile device 4 is PHS (Per
sonal Handy Phone System)
Etc. are signals used for communication in a wireless section in mobile communication.

In FIG. 6, the mobile station 4a or 4b transmits the downlink MAC frame from the radio base station 3 shown in FIG.
The state of the collision control bit field shown in FIG. 4 is checked, and when it is detected that the uplink radio packet channel is in an idle (transmission permitted) state, if a transmission request is issued from the data terminal 5, the uplink MAC frame (transmission right) shown in FIG. Request) to the wireless base station 3, and requests the wireless base station 3 for a transmission right (SABME in the figure).

At this time, the MAC from both mobile units 4a, 4b
When the transmission of the frame collides, the radio base station 3 cannot normally receive the frame, so that the state of the uplink radio packet channel remains in the idle state. In this case, the mobile stations 4a and 4b check the state of the uplink wireless packet channel after transmitting the MAC frame, and determine that the transmission frames have collided because the state of the uplink wireless packet channel does not change even after a predetermined time has elapsed, and the random delay Request for transmission again after performing (Transmit Request in the figure)
st).

When the radio base station 3 normally receives the transmission right request from the mobile station 4b, it gives the transmission right to the mobile station 4b using the downlink MAC frame (transmission permission) shown in FIG. 4 (Transmit Reply in the figure). ). Thereafter, the mobile device 4b transmits data to the radio base station 3 using the uplink MAC frame shown in FIG. The wireless base station 3 sets the state of the uplink wireless packet channel to a busy state (busy in the figure) and disables transmission from another mobile station 4.

When the radio base station 3 receives the frame from the mobile station 4b, it converts the upstream MAC frame into an LLC frame as shown in FIG.
The base station controller 2 transmits an acknowledgment as a response signal to the mobile station 4b via the wireless base station 3. Next, the base station control device 2 transmits data to the existing data terminal 6 which is a communication partner via the LAN 1.

When data is transmitted from the existing data terminal 6 to the mobile station 4 (data terminal 5) b, the base station controller 2 transmits the data from the existing data terminal 6 to the LAN 1
, The data is transmitted to the wireless base station 3. The radio base station 3 converts the LLC frame of the data received from the base station control device 2 into a MAC frame as shown in FIG. 2, and then transmits the MAC frame to the mobile station 4b. Upon completion of data transmission to the mobile station 4b, the base station control device 2 notifies the radio base station 3 that it is necessary to receive delivery confirmation from the mobile station 4b, and starts a timer for waiting for delivery confirmation. .

The radio base station 3 having received the above notification confirms the state of the collision control bit of the uplink radio packet channel,
A mobile station that attempts to transmit a delivery confirmation from the next transmission timing when the mobile station is currently in the idle state, or when transmission from another mobile station 4 that is currently granted the transmission right is completed in the busy state. 4, or a state with a constraint (hereinafter referred to as a limit state) that gives a transmission right only to the mobile station 4 that is notified of a transmission error from the base station control device 2 and intends to retransmit the frame in which the error has occurred. The state of the uplink radio packet channel is set to each mobile station 4 by setting the collision control bit shown in FIG. 5 (state of availability).
Notify.

The mobile station 4b which has received the frame from the radio base station 3 converts the downlink MAC frame into LL as shown in FIG.
After converting the LLC frame into a C frame, the LLC frame is transmitted to the data terminal 5. When detecting the necessity of transmitting the acknowledgment for the received LLC frame to the base station control device 2, the data terminal 5 instructs the mobile station 4b to transmit the acknowledgment, which is a response signal. The mobile device 4b checks the collision control bit field shown in FIG. 5 of the downlink MAC frame shown in FIG. 4, and performs a random delay when busy.

When the collision control bit is in the idle state or the limit state, a transmission right acquisition request is transmitted. Thereby, the mobile station 4b to which the transmission right has been given from the wireless base station 3 transmits an acknowledgment. The base station control device 2 that has received the acknowledgment via the radio base station 3 stops the timer started when the acknowledgment is requested.

As described above, the state in which the transmission right is preferentially given to the mobile station 4 which is to transmit the acknowledgment is added to the collision control bit field of the downlink radio packet channel for notifying the state of the uplink radio packet channel. Thereby, it is possible to receive and detect the acknowledgment before the acknowledgment timer provided in the base station controller 2 times out. Therefore, according to this embodiment, the base station controller 2 does not need to retransmit the transmitted data to the data terminal 5, and as a result, data transmission between the base station controller 2 and the data terminal 5 It is possible to improve the efficiency of the system.

Embodiment 2 1 to 5,
This is as described in the first embodiment. FIG. 7 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention. In FIG. 7, mobile unit 4 (terminal 5)
a, signal between LLC and MAC of mobile device 4 (terminal 5) b,
And the MAC of the radio base station 3 and the LL of the base station controller 2
The signal between C is a signal used in the layer 2 HDLC procedure. The signal between the wireless base station 3 and the mobile device 4 is a signal used for communication in a wireless section in mobile communication such as PHS.

In FIG. 7, the radio base station 3 which has normally received the transmission right request (Transmit Request in the figure) from the mobile station 4b transmits the request to the mobile station 4b using the downlink MAC frame (transmission permission) shown in FIG. Rights (T in FIG. 7)
transmit Reply). Thereafter, the mobile device 4b transmits transmission data (User Data in FIG. 4) in the uplink MAC frame shown in FIG. The wireless base station 3 sets the state of the uplink wireless packet channel to a busy state (busy in the figure) and disables transmission from another mobile station 4.

The radio base station 3 sends the MAC
When the frame is received, the uplink MAC frame is converted into an LLC frame and transmitted to the base station controller 2 as shown in FIG. Base station controller 2 that has received the LLC frame
Checks the sequence numbers of a plurality of LLC frames transmitted from the data terminal 5 connected to the mobile device 4b, and checks whether or not each LLC frame has a transmission error.

As a result of the above check, the base station controller 2
When an undelivered LLC frame is detected or an erroneous LLC frame is detected, a frame in which an error is detected from the mobile device 4b to the radio base station 3 (hereinafter, referred to as a frame).
It notifies that it is necessary to receive retransmission of an error frame), and starts a timer for waiting for error frame retransmission.

The radio base station 3 having received the above notification checks the state of the collision control bit field of the downlink radio packet channel, and if the state of the collision control bit field is currently in the idle state, the radio base station 3 starts the next transmission timing. When the state of the collision control bit field is busy, when the transmission from the mobile station 4 that is currently giving the transmission right is completed, the mobile station 4 or the base station control device 2 that is to transmit a delivery confirmation. A limit state for giving a transmission right only to the mobile station 4 which is notified of the transmission error and intends to retransmit the error frame is set in the collision control bit field shown in FIG. 5, and each mobile station 3 is notified of the state of the uplink radio packet channel. (USPCH in the figure).

Further, the radio base station 3 transmits the downlink MA shown in FIG.
An LLC frame in which information of a data terminal to be retransmitted and an LLC frame number requesting retransmission is set is converted into a C frame and transmitted.

The mobile station 4b which has received the frame from the radio base station 3 converts the downlink MAC frame into LL as shown in FIG.
The data is converted into a C frame and transmitted to the data terminal 5. The data terminal 5 transmits the L transmitted by itself from the received LLC frame.
It detects that the LC frame is in error, instructs the mobile station 4b to retransmit, and sets the LL in error.
Transmit the C frame. The mobile device 4b confirms the state indicated by the collision control bit shown in FIG. 5 of the downlink MAC frame shown in FIG.

If the collision control bit field is busy, a random delay is performed. When the collision control bit is in an idle state or a limit state, a transmission right acquisition request is transmitted. As a result, the mobile station 4b to which the transmission right has been given by the radio base station 3 converts the LLC frame in which the transmission error has occurred into an upstream MAC frame and transmits the frame. The base station control device 2 that has normally received the LLC frame retransmitted via the radio base station 3 stops the timer started when requesting retransmission.

As described above, the mobile station 4 that attempts to retransmit an LLC frame having a transmission error in the collision control bit field of the downlink radio packet channel for notifying the state of the uplink radio packet channel from the radio base station 3 has priority. By newly providing a state for granting a transmission right, the retransmitted error frame is received before the timer provided in the base station control device 2 and detecting the non-reception of the retransmitted error frame expires. It becomes possible. Therefore, according to this embodiment, it is possible to prevent the base station controller 2 from discarding other frames transmitted from the mobile device 4 and received normally, and as a result, the base station controller 2 and data terminal 5
It is possible to improve the transmission efficiency between the two.

Embodiment 3 FIG. 8 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention.

FIGS. 1 to 5 are as described in the first embodiment.

In FIG. 8, signals between LLC and MAC of mobile unit 4 (terminal 5) a and mobile unit 4 (terminal 5) b, and
Signals between the MACs of the wireless base stations 3a and 3b and the LLC of the base station controller 2 are HDL signals used for layer 2.
This is a signal used by the C procedure. The signal between the wireless base station 3 and the mobile device 4 is a signal used for communication in a wireless section in mobile communication such as PHS.

In FIG. 8, the radio base station 3b that has normally received the transmission right request from the mobile station 4b receives the downlink M shown in FIG.
The transmission right is given to the mobile station 4b by the AC frame (transmission permission). Thereafter, the mobile device 4b transmits the transmission data to the radio base station 3b in the uplink MAC frame shown in FIG. at the same time,
The radio base station 3b sets the state of the uplink radio packet channel to a busy state, and prohibits transmission from mobile devices 4 other than the mobile device 4b. When the state of the wireless packet channel deteriorates during communication with the wireless base station 3b, the mobile station 4b
In response to a plurality of LLC frame transmission requests from the data terminal 5, when transmission of an arbitrary LLC frame is completed,
Handover to another wireless base station 3a.

At this time, if the uplink radio packet channel of the destination radio base station 3a is in an idle state (transmission permitted state), the mobile station 4b transmits the remaining L from the data terminal 5.
In order to transmit an LC frame, the wireless base station 3a requests a transmission right (Transmit Re in the figure).
quest). The radio base station 3a that has normally received the transmission right request from the mobile device 4b gives the transmission right to the mobile device 4b with the downlink MAC frame (transmission permission) shown in FIG.
submit Request).

Thereafter, the mobile station 4b operates as the uplink MAC shown in FIG.
Transmit transmission data by frame (USPC in the figure)
H). At the same time, the wireless base station 3a sets the state of the uplink wireless packet channel to a busy state, and disables transmission from mobile devices 4 other than the mobile device 4b (busy in the figure).

The radio base station 3a converts the uplink MAC frame transmitted from the mobile unit 4b into an LLC frame and transmits the frame to the base station controller 2. In this way, the base station control device 2 sends the mobile station 4 via the destination wireless base station 3a.
When receiving the subsequent LLC frame transmitted from the data terminal 5 connected to the wireless terminal 4b, the mobile station 4b recognizes that the handover has been performed from the wireless base station 3b to the wireless base station 3a, and via the wireless base station 3b. Regarding the acknowledgment of the transmission of the transmitted LLC frame, the destination radio base station 3a
To the data terminal 5 connected to the mobile device 4b.

As described above, when the mobile station 4b performs a handover during transmission of a frame, the mobile station 4b is connected to the mobile station 4b via the radio base station 3b connected before the execution of the handover. As a response to the frame transmitted from the data terminal 5 to the base station controller 2, the base station controller 2 transmits a delivery confirmation to the data terminal 5 via the handover destination wireless base station 3a. Before the execution of the handover, the mobile station 4
b transmitted from the data terminal 5 to the base station controller 2
The data terminal 5 can receive the acknowledgment transmitted from the base station controller 2 to the data terminal 5 as a response to the LC frame.

Therefore, according to this embodiment, the data terminal 5 can prevent a situation where the acknowledgment from the base station control device 2 has not been received. Since the retransmission of the frame transmitted to the control device 2 can be prevented, the transmission efficiency of the entire communication can be improved accordingly.

Embodiment 4 FIG. 9 is a data structure diagram showing another embodiment of the wireless packet access method according to the present invention. In FIG. 9, USP (Up Slot)
The “Information” field indicates the state (idle, busy, limit) of the uplink wireless packet channel, and the Receive / Not Receive field indicates the presence or absence of an error in the uplink wireless packet channel of the transmission frame from the mobile device 4 that has acquired the transmission right. , Re
The send Req / Ack Req (request type) indicates a retransmission request / delivery confirmation, and includes a PS-ID (Personnel).
l Station-IDentifier) indicates the identifier of the mobile device 4 connected to the data terminal 5 to which the transmission right is given priority.

In the first and second embodiments, the base station controller 2 transmits a transmission confirmation request to the data terminal 5 connected to the mobile station 4 or a retransmission request of an LLC frame in which an error is detected. The state of the uplink radio packet channel is notified to each mobile station 4 as a limit state in the collision control bit field of the downlink radio packet channel without discriminating the confirmation request and the retransmission request and the mobile station 4 which requests the retransmission request. However, priority has been equally given to all the mobile devices 4 that are going to perform delivery confirmation and retransmission.

In this embodiment, the collision control bit field shown in FIG. 5 is extended (Resen) as shown in FIG.
d Req / Ack Req field and PS-ID field), and the base station controller 2 uses the same method as in the first and second embodiments, that is, sets the type of frame requested to be transmitted to Resend. Req / A
By specifying the mobile device requested to transmit a frame by the PS-ID in the ck Req field and by the PS-ID, the data terminal connected to the mobile device 4 having the strictest time until the activated timer times out. 5, the transmission right can be given priority.

Therefore, it is possible to avoid a collision of a transmission right request from each mobile station 4 for acquiring a priority due to a retransmission request and a delivery confirmation request, and it is possible to further improve the transmission efficiency of the entire communication. This has the effect of becoming

Embodiment 5 Generally, in a mobile communication system, the handy type mobile device 4 operates with a battery. Therefore, in order to extend the use time of the mobile station 4, the mobile station 4 is turned on at regular intervals when it is not in use, receives the control channel from the radio base station 3 at that timing, and Check if there is an incoming call to the station.
Here, when the mobile station 4 detects an incoming call to its own station, it starts communication with the power on, and when no incoming call to its own station is detected, turns off the power and performs battery saving.

The above-described battery saving is mainly an operation in a voice system, but a similar battery saving function is required in wireless packet communication. When the LLC frame transmitted from the base station control device 2 is transmitted to the data terminal 5 via the mobile device 4, the data terminal 5 inevitably tries to transmit a delivery confirmation. However, the LLC control of the data terminal 5 and the MAC
Since the control operates independently, when the mobile station 4 completes the transmission of the LLC frame requested by the data terminal 5, the mobile station 4 enters the intermittent reception mode without waiting for the acknowledgment.

While the mobile station 4 is in the intermittent reception mode, the base station controller 2 issues a request for retransmission of an LLC frame in which an error has been detected from the base station controller 2 via the radio base station 3 to the mobile station 4. , The mobile terminal 4 does not operate, and the data terminal 5 connected to the mobile terminal 4 is not notified. Accordingly, not only does the transmission efficiency decrease while the uplink radio packet channel is in the limit state, but also the timer of the base station control device 2 times out, so that the base station control device 2 has received normally by then. Since the LLC frame is discarded, the transmission efficiency of the entire communication decreases.

FIG. 10 is a data structure diagram showing another embodiment of the radio packet access method according to the present invention, which is a radio base station. FIG. 3 is a configuration diagram showing a slot configuration of a frame for notifying a mobile station 4 performing intermittent reception of a retransmission request. Slots indicated by diagonal lines in the figure are slots for operating the mobile station 4 which is considered to be performing intermittent reception, and the downlink MAC frame (transmission permission) shown in FIG.
The other slots are slots for notifying the operating mobile station 4 of the state of the uplink MAC frame or transmitting a frame to a specific mobile station 4.
Is used.

The mobile unit 4 during the intermittent reception is operating in accordance with the transmission timing of the hatched slot, and otherwise enters the battery saving mode. Also,
If the active mobile station 4 is receiving a frame from the base station controller 2, it discards the frame in the hatched slot and receives the frame in the other slot.

When the base station controller 2 notifies the base station controller 2 of a retransmission request to a specific mobile station 4, the base station 3 obtains the transmission right of the uplink radio packet channel currently received by the base station and transmits it. The mobile device 4 confirms whether the mobile device 4 is the mobile device 4 designated by the base station control device 2 or not. If the mobile device is the same, the LLC frame transmitted from the base station control device 2 is directly converted into a downlink MAC frame and transmitted to the mobile device 4.

If the mobile station 4 currently acquiring the transmission right is a mobile station 4 different from the mobile station 4 specified by the base station controller 2, the state of the uplink radio packet channel is idle. The mobile station 4 during intermittent reception is activated using the mobile station activation slot shown in FIG. 10 when the mobile station 4 enters the idle state, and then the downlink radio packet channel is shown in FIG. The limit state, the retransmission request, and the PS-ID of the mobile station 4 to which the transmission right is given are set in the collision detection bit field, and the transmission right is given with priority.

As described above, under the control of the radio base station 3,
Whether the mobile station 4 that is the target of the retransmission request is intermittently receiving,
It is possible to determine whether the mobile device 4 is in operation, and it is possible to efficiently give the transmission right to the target mobile device 4.

The mobile station 4 in the intermittent reception mode may be activated using a control channel like voice communication.

Embodiment 6 FIG. FIG. 11 is a sequence diagram showing one embodiment of the wireless packet access system according to the present invention. In the first to fifth embodiments, when the base station control device 2 notifies the radio base station 3 of a retransmission request or a delivery confirmation request, the uplink radio packet channel is used by another mobile station 4. When the mobile station 4 is in the busy state, the radio base station 3 completes the transmission of the other mobile station 4 currently acquiring the transmission right and sets the uplink radio packet channel to the idle radio channel channel. Is set to the limit state, and the transmission right is given to the mobile station 4 to be subjected to the "retransmission request" or the "delivery confirmation request".

However, in the above procedure, if the transmission frame from the other mobile station 4 currently acquiring the transmission right is long, the mobile station to be subjected to the “retransmission request” or the “delivery confirmation request” Before the transmission right is given to the mobile station 4, the timer for “retransmission” or “delivery confirmation not received” provided in the base station controller 2 times out, so that the mobile station 4 and the radio The LLC frame normally received by the base station controller 2 via the base station 3 is discarded, or the LLC frame transmitted via the radio base station 3 and the mobile device 4 to the data terminal 5 is retransmitted. Will do.

The present invention has been made to solve such a problem. Next, the operation will be described with reference to FIG. As shown in FIG. 11, the mobile station 4 (data terminal 5) b acquires the transmission right of the uplink radio packet channel to the radio base station 3, and starts transmitting a frame. When the transmission of the frame is completed, the radio base station 3 sets the state of the uplink radio packet channel in the collision control bit field of the downlink radio packet channel to the idle state, and notifies each mobile device 4 that transmission is possible. The received frame is converted into an LLC frame, and the base station controller 2
Send to

Thus, the other mobile station 4 (data terminal 5) a acquires the transmission right and starts transmitting the frame.
When detecting an error in the LLC frame received from the mobile device 4 (data terminal 5) b, the base station control device 2 issues a "retransmission request" for the LLC frame or executes the mobile device 4 (data terminal 5) b When the LLC frame is transmitted as a response to the LLC frame received from the wireless base station 3, the wireless base station 3 requests the wireless base station 3 for the delivery confirmation request.

The radio base station 3 receiving the above request instructs the other mobile station 4a currently acquiring the transmission right of the uplink radio packet channel to suspend the transmission of the frame. Further, the radio base station 3 sets “limit state”, “retransmission request / delivery confirmation request”, and “PS-ID” of the mobile station 4b to which the transmission right is assigned in the collision control bit field shown in FIG. 9 of the downlink radio packet channel. Then, the mobile station 4 is notified of the state of the uplink wireless packet channel.

The mobile station 4b, which has been notified of the state of the uplink radio packet channel, recognizes that its own station has been given a transmission right, and transmits a designated retransmission frame or a delivery confirmation. Upon receiving the “retransmission frame” or “delivery acknowledgment” from the mobile station 4b, the radio base station 3 permits the mobile station 4a, which has instructed to suspend transmission, to resume transmission, and , The state of the uplink wireless packet channel in the collision control bit field is set to a busy state, and transmission of another mobile station 4 is prohibited.

As described above, according to this embodiment, even when another mobile station 4 is using the uplink radio packet channel, the transmission confirmation or the retransmission request can be transmitted preferentially. It is possible to prevent the retransmission of the LLC frame due to the unacknowledged reception of the base station controller 2 or the discard of other normally received LLC frames due to the unreception of the retransmission request frame, thereby improving the transmission efficiency of the entire communication. This has the effect of being possible.

Embodiment 7 Embodiments 1 to 6 aim at improving the transmission efficiency of the entire communication when the number of wireless packet channels between the wireless base station 3 and the mobile device 4 is one. The present embodiment aims at improving the transmission efficiency of the entire communication when there are a plurality of wireless packet channels between the wireless base station 3 and the mobile device 4.

FIG. 12 is a sequence diagram showing another embodiment of the radio packet access method according to the present invention.
FIG. 13 is a structural diagram showing a configuration of a collision control bit field of a downlink radio packet channel used in this embodiment. The wireless base station 3a has two wireless packet channels A and B with the plurality of mobile stations 4. The mobile station 4 (data terminal 5) b receives the wireless packet channel A and confirms that the state of the uplink wireless packet channel A is an idle state.
The transmission right of the wireless packet channel A is requested.

The radio base station 3a that has received the “transmission right request” from the mobile station 4 (data terminal 5) b gives the transmission right to the mobile station 4 (data terminal 5) b, and sets the downlink radio packet channel. A busy state is set in the collision control bit field of A, and transmission from another mobile station 4 is prohibited.
The mobile station 4 (data terminal 5) b that has acquired the transmission right transmits the remaining frames. When the transmission of the frame is completed, the radio base station 3a stores the uplink radio packet channel A in the collision control bit field of the downlink radio packet channel A.
Sets an idle state indicating that the mobile station 4 is in an idle state, notifies each mobile device 4 that transmission is possible, and converts the received MAC frame into an LLC frame and transmits it to the base station controller 2.

Thus, the other mobile station 4 (data terminal 5) a acquires the transmission right and starts transmitting the frame.
The base station control device 2 is configured to execute the mobile station 4 (data terminal 5) b
When an error is detected by receiving the LLC frame from
It requests retransmission of this LLC frame, or transmits an LLC frame in response to the LLC frame received from the mobile station 4 (data terminal 5) b, and requests the radio base station 3a for its delivery confirmation request. The radio base station 3a receiving the above request from the base station control device 2 transmits a radio packet to which the mobile station 4 (data terminal 5) b to be subjected to the "delivery confirmation request" or "retransmission request" is to communicate. It detects that channel A is already being used by another mobile station 4a.

Therefore, the radio base station 3a checks the state of another radio packet channel B and detects that this radio packet channel B is in an idle state. When the wireless base station 3a detects that the wireless packet channel B is in the idle state,
In the collision control bit field shown in FIG. 3, the state of the wireless packet channel A, the "delivery confirmation / retransmission request" of the uplink MAC frame to the mobile station 4a, and the mobile station 4b to be requested
“Delivery confirmation request / error frame and retransmission request”,
"PS-ID", "wireless packet channel B permitting retransmission or acknowledgment of transmission" are set and transmitted, and "limit state", "retransmission request" or "delivery" is set in the collision control bit field of downlink wireless packet channel B. Confirmation "and" PS-ID of target mobile station 4b "are set, and each mobile station 4 in the service area of wireless packet channel B is notified.

[0094] Of the mobile stations 4 (data terminals 5) that have received the downlink radio packet channel A, the mobile station 4 (data terminal 5) b transmits to its own station "retransmission" or
"Delivery acknowledgment" is requested, and the wireless packet channel A is currently used by the mobile device 4 (data terminal 5) a, and transmission is requested using the wireless packet channel B. And switches the wireless packet channel being received from A to B. Thereafter, the switched downlink wireless packet channel B is received,
By examining the collision control bits shown in FIG. 13, it is detected that the transmission right is given to the own station preferentially, and "retransmission" of the frame is performed.

As described above, according to this embodiment, "retransmission" or "retransmission" of mobile station 4 (data terminal 5) b is performed without interrupting transmission of mobile station 4 (data terminal 5) a during frame transmission. Since “delivery confirmation” can be transmitted at the same time, the transmission efficiency of the entire communication is improved.

Embodiment 8 FIG. In another embodiment other than the sixth embodiment, when one or more radio packet channels are used and a "delivery confirmation" or "retransmission request" is required for a certain mobile station 4 To
When all the radio packet channels are used by another mobile device 4, there is a possibility that the detection timer of the non-reception of the delivery confirmation and the detection of the non-reception of the retransmission request frame activated by the base station controller 2 may time out, In the case of this timeout, the LLC normally transmitted from the base station control device 2 to the data terminal 5 via the radio base station 3 and the mobile device 4
This causes a problem that the frame is retransmitted or the LLC frame normally transmitted from the data terminal 5 to the base station controller 2 via the mobile station 4 and the radio base station 3 is discarded.

The present invention has been made to solve the above problems. FIG. 14 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention, and shows an operation flow of the wireless base station 3. Hereinafter, the operation of this embodiment will be described with reference to FIG. FIG.
As shown in FIG. 4, it is assumed that, out of the two wireless packet channels A and B of the wireless base station 3a, the wireless packet channel B is used by another mobile station 4 and is in a busy state. When the mobile station 4 (data terminal 5) b receives the downlink radio packet channel A and confirms that the state of the uplink radio packet channel A is an idle state, the mobile station 4 (data terminal 5) transmits the uplink radio packet channel A to the radio base station 3a. Request the transmission right of channel A.

Upon receiving the transmission right request from the mobile station 4 (data terminal 5) b, the radio base station 3a
(Data terminal 5) A transmission right is given to b, and a busy state is set in the collision control bit field of the downlink radio packet channel A to prohibit transmission from another mobile station 4. The mobile station 4 (data terminal 5) b that has acquired the transmission right transmits the remaining frames. When the transmission of the frame is completed, the wireless base station 3a sets an idle state indicating that the upstream wireless packet channel A is in the idle state in the collision control bit field of the downstream wireless packet channel A, and can transmit to the mobile devices 4. And converts the received MAC frame into an LLC frame and transmits it to the base station controller 2.

Thus, the other mobile device 4 (data terminal 5) a acquires the transmission right and starts transmitting a frame.
The base station control device 2 is configured to execute the mobile station 4 (data terminal 5) b
When an error is detected by receiving the LLC frame from
It performs a “retransmission request” for this LLC frame, or transmits an LLC frame in response to the LLC frame received from the mobile device 4 (data terminal 5) b, and requests the wireless base station 3a for a delivery confirmation request. Upon receiving the retransmission request or the acknowledgment request, the radio base station 3a transmits the uplink radio packet channel to which the mobile station 4 (data terminal 5) b to be subjected to the “delivery acknowledgment request” or the “retransmission request” communicates. A detects that A is being used by another mobile device 4a.

Next, the radio base station 3a checks the status of the other uplink radio packet channel B managed by the radio base station 3a, and the uplink radio packet channel B is also used by another mobile station 4, and is in a busy state. "Retransmission frame", or
When recognizing that there is no uplink wireless packet channel that can transmit “acknowledgement”, the base station controller 2 is notified of an RNR (Receive Not Ready) instead of the mobile station 4 (data terminal 5) b. Send a frame.

When the base station controller 2 receives the RNR (unreceivable) from the radio base station 3a, the mobile station 4 (data terminal 5) b which has requested the "acknowledgement" or the retransmission frame transmits the uplink radio packet channel. Judgment that the transmission right has not been acquired, the "delivery acknowledgment not received" is detected, or the timer for "retransmission frame non-received detection" is stopped, and after a certain delay, the radio base station is again 3a, a “delivery request” or “retransmission request” is transmitted. At this time, if there is an idle uplink radio packet channel, the transmission right is given to the target mobile station 4b.

As described above, according to this embodiment,
Even when the mobile station 4 (data terminal 5) b that is the object of the “delivery confirmation request” or “retransmission request” cannot acquire the transmission right of the uplink radio packet channel, the base station controller 2 The timer for “detection of non-reception of reception confirmation” or “detection of non-retransmission frame reception” provided is prevented from timing out, so that the radio base station 3a and the mobile station 4b are transmitted from the base station controller 2 to the radio base station 3a. Via the mobile terminal 4b and the radio base station 3a from the data terminal 5 to the base station controller 2 by "retransmitting" the LLC frame normally transmitted to the data terminal 5 It is possible to prevent frames from being discarded, and it is possible to improve the transmission efficiency of the entire communication.

Embodiment 9 FIG. FIG. 15 is a flowchart showing another embodiment of the wireless packet access method according to the present invention, and shows an operation flow of the wireless base station 3. Hereinafter, the operation of the wireless base station 3 will be described using this flow.

As shown in the sixth, seventh, and eighth embodiments, as means for improving the transmission efficiency of the entire communication, transmission of another mobile station 4 using an uplink radio packet channel is performed. To temporarily suspend the retransmission or transmission of the acknowledgment of the target mobile device 4 with priority.
When the wireless base station 3 has a plurality of wireless packet channels, the uplink wireless packet channel in the service area of the mobile station 4 targeted for retransmission or acknowledgment transmission is being used by another mobile station 4. Sometimes, a method of notifying an idle uplink radio packet channel and enabling retransmission and transmission of transmission confirmation by the uplink radio packet channel is used, and all uplink radio packet channels are used by another mobile device 4 in a congested state. In some cases, there is a method in which the radio base station 3 notifies the base station controller 2 that there is no idle uplink radio packet channel, and retransmits a retransmission request or an acknowledgment request.

In the above three methods, retransmission or transmission of acknowledgment can be performed immediately, and another method can be performed immediately if there is an idle uplink radio packet channel.
The method is divided into a method of waiting until an uplink wireless packet channel constituting a service area in which a retransmission request or a delivery confirmation request exists is released from another mobile station 4. Therefore, by including the priority in the “PS-ID” of each mobile station 4, the radio base station receiving the retransmission request or the delivery confirmation request from the base station control device 2 according to the priority of the mobile station 4. Reference numeral 3 selects the above three methods and performs processing.

As shown in the flowchart of FIG. 15, when an uplink radio packet channel constituting the service area of the mobile station 4 to be retransmitted or confirmed for transmission is used by another mobile station 4, Based on the “PS-ID” of the mobile station 4 to be retransmitted or confirmed for transmission, the radio base station 3 determines the priority of the mobile station 4 to be confirmed for transmission from the base station controller 2. I do. When the priority is the highest (priority A), the radio base station 3 interrupts the transmission of the other mobile device 4 and gives the transmission right to the target mobile device 4.

If the priority is medium (priority B), the radio base station 3 checks the use status of another uplink radio packet channel, and if there is an idle uplink radio packet channel, the Then, the transmission right is given to the target mobile station 4, and if there is no idle uplink radio packet channel, the processing for the lowest priority described later is performed.

In the case where the priority is the lowest (priority C),
The radio base station 3 notifies the base station controller 2 of the congestion of the uplink radio packet channel, and instructs the base station controller 2 to transmit a retransmission request or a delivery confirmation request again after a certain delay.

As described above, according to the present embodiment, the priority is added to the mobile device 4 and the radio base station 3 performs the process according to the priority, so that the communication is preferentially performed according to the priority. It is possible to perform the operation.

Embodiment 10 FIG. Generally, in the HDLC procedure, as a response to a transmission frame from a communication partner,
“Delivery confirmation” can be attached to the frame transmitted to the communication partner. However, in the sixth embodiment, after the radio base station 3 acquires the transmission right of the uplink radio packet channel and suspends the transmission of the other mobile station 4 that is transmitting the frame, the radio base station 3 transmits the uplink radio packet channel. The state is set to the limit state, and a transmission right is given to the mobile station 4 to be subjected to the “retransmission request” or the “delivery confirmation request”.

In this case, the data terminal 5 connected to the mobile station 4 to which the transmission right has been given in the limit state is notified that the data terminal 5 has received “newly transmitted” in addition to “delivery confirmation” or “requested retransmission data”. If the “transmission frame that has occurred” is also transmitted, there is a problem that it takes time to re-grant the transmission right to the mobile device 4 whose transmission has been interrupted. The present invention has been made to solve such a problem.

FIG. 16 is a flowchart showing another embodiment of the radio packet access method according to the present invention, and shows an operation flow of the radio base station 3. FIG. 17 is a flowchart showing an operation flow of the mobile device 4 and the data terminal 5 in this embodiment. FIG. 18 is a data structure diagram showing a structure of a collision control bit field of a downlink radio packet channel in this embodiment.

Next, the operation of this embodiment will be described with reference to FIGS. Upon receiving the “retransmission request” or the “acknowledgement request” for the specific mobile station 4 from the base station controller 2, the radio base station 3, as shown in the flow of FIG. 16, based on the state of the uplink radio packet channel. The collision control bit field shown in FIG. 18 is set, and the mobile station 4 that is the target of “retransmission” or “transmission confirmation transmission” is notified.

In the processing of the first to ninth embodiments,
The radio base station 3 limits the uplink radio packet channel when the uplink radio packet channel is in the idle state when granting the transmission right to the mobile station 4 to be subjected to the “retransmission request” or the “delivery confirmation request”. When the state is set, the mobile station 4 is notified by setting the transmission enable / disable of the new frame transmission in the collision control bit field of the downlink radio packet channel shown in FIG.

Further, as shown in FIG. 17, the mobile station 4 which has received the information of "transmission of a new frame" is "can transmit a new frame" to the data terminal 5 connected to its own station. Notify. When there is a frame to be newly transmitted, the data terminal 5 transmits “delivery confirmation” or
Along with the “retransmission frame”, the “new transmission frame” is transmitted to the base station controller 2 via the mobile device 4 and the radio base station 3.

Also, when the radio base station 3 gives the transmission right to the mobile station 4 that is the object of the “retransmission request” or “delivery confirmation request”, the uplink radio packet channel is used by another mobile station 4. If the state is busy, the radio base station 3 interrupts the transmission from the other mobile station 4 using this uplink radio packet channel and sets the limit state. For this purpose, the “new frame transmission enabled / disabled” in the collision control bit field shown in FIG. 18 is set to disabled and the mobile station 4 that is the target of the “retransmission request” or “delivery confirmation request” is notified.

When the mobile station 4 that is the object of the “retransmission request” or the “acknowledgement request” receives the information “cannot transmit a new frame” from the radio base station 3, it is connected to its own station as shown in FIG. That the transmission of a new frame is not possible. When receiving this notification from the mobile station 4, the data terminal 5 does not transmit the new frame even if there is a frame to be newly transmitted, and transmits only the requested "delivery confirmation" or "retransmission frame" to the mobile station 4. , Base station controller 2 via radio base station 3
Send to

As described above, according to this embodiment, when the uplink radio packet channel is in the idle state, the mobile station transmits a new frame at the timing of a retransmission request or delivery confirmation notified from the base station controller. Since transmission is performed, it is possible for the mobile station to perform transmission without requesting the transmission right, and therefore, it is possible to reduce the number of random accesses by the mobile station and prevent collision of transmission right acquisition requests. Become.

When the transmission of another mobile station using the uplink radio packet channel is interrupted and the transmission right is given to the mobile station to which a retransmission request or a delivery confirmation request is to be issued, a new transmission is performed. Even if there is a frame to
Since the transmission of only the retransmission frame or the delivery confirmation is permitted without transmitting the new frame, the transmission of the frame of the mobile station whose transmission has been interrupted can be promptly restarted.

Embodiment 11 FIG. FIG. 19 is a flowchart showing another embodiment of the wireless channel access method according to the present invention, and shows an operation flow of the wireless base station 3.
In the tenth embodiment, the mobile station 4 which is the target of the “retransmission request” or the “delivery confirmation request” from the mobile station 4 and the base station controller 2 that are transmitting and acquiring the transmission right of the uplink wireless packet channel. Were processed on an equal basis.
In this embodiment, as shown in the operation flow of the radio base station 3 in FIG. 19, the priority included in the “PS-ID” of the mobile station 4 is used in the same manner as in the ninth embodiment.

The radio base station 3 obtains the transmission right of the uplink radio packet channel and sends a “retransmission request” or “delivery confirmation request” from the mobile station 4 and the base station controller 2 that are transmitting.
Are compared with each other. As a result of the comparison, if the priority of the mobile station 4 that has acquired the transmission right and is transmitting is high or equal, the “new frame transmission enabled / disabled” of the collision control bit field shown in FIG. On the other hand, when the priority is low, the “new frame transmission enabled / disabled” is set to “enabled” and the mobile station 4 that is the target of the “retransmission request” or “delivery confirmation request” is notified.

The operations of the mobile station 4 and the data terminal 5 which have been notified of the above-mentioned "new frame transmission enabled / disabled" information are the same as the operations of the tenth embodiment shown in FIG.

As described above, according to this embodiment, it is possible to give priority to the transmission of a frame from the mobile station 4 having a high priority.

Embodiment 12 FIG. FIG. 20 is a flowchart showing another embodiment of the wireless packet access method according to the present invention, and shows an operation flow of the mobile station 4. When the mobile station 4 tries to acquire the transmission right of the uplink radio packet channel in response to a transmission request from the data terminal 5, if the uplink radio packet channel is used by another mobile station 4 and is busy, the Mobile device 4
Performs a random delay up to the maximum time for which the transmission right can be held by one transmission right acquisition, and tries transmission right acquisition again.

However, if the uplink radio packet channel is still being used by another mobile station 4, the state of the uplink radio packet channel when random delay is performed, and another mobile station 4 is requested to transmit. Based on the type of the frame, the upper limit of the maximum time during which the other mobile station 4 can hold the transmission right is selected, and a random delay or a fixed delay within that range is performed. As a result, it is possible to prevent the possibility that the transmission right cannot be easily obtained due to the random delay despite the state of the uplink wireless packet channel being in the idle state.

In the first to twelfth embodiments,
As the upper limit value of the random delay, the upper limit value in the case of collision with another mobile device 4 at the time of requesting the transmission right, the other mobile device 4 is securing the transmission right when trying to request the transmission right, In this case, there is an upper limit value of the maximum time during which the transmission right can be held, and an upper limit value in a limit state in which the transmission right is preferentially given to another mobile device 4 for a delivery confirmation request.

As shown in FIG. 20, when a mobile station 4 detects a collision of a transmission right request with another mobile station 4, the mobile station 4 performs a random delay below the upper limit value at the time of collision, and makes the uplink radio packet channel busy. If the state is detected, random delay is performed below the upper limit of the maximum time for which the transmission right can be held, and if the request to the mobile station 4 that detects the limit state and gives priority to the transmission is a retransmission frame, Random delay is performed below the upper limit value of the maximum time for which the transmission right can be held, the limit state is detected, and when the request to the mobile station 4 that gives priority to the transmission right is unknown, and in the case of a delivery confirmation request, the transmission is performed. Perform a constant delay below the upper limit sufficient to send an acknowledgment.

As described above, by performing the delay with the optimum value according to the state of the uplink wireless packet channel and the type of the transmission frame required for the mobile station 4 to which the transmission right is preferentially given, the uplink wireless channel is provided. Since the delay can be immediately terminated in accordance with a change in the state of the packet channel, there is an effect that the mobile station 4 can efficiently acquire the transmission right of the uplink wireless packet channel.

[0129]

As described above, according to the first aspect of the present invention, the collision control bit of the downlink radio packet channel for notifying the status of the uplink radio packet channel from the radio base station includes the frame transmitted from the base station controller. A new state in which a transmission right is preferentially given to a mobile station that intends to transmit an acknowledgment for transmission to a mobile station due to timeout of a timer that detects non-reception of an acknowledgment in the base station controller is provided. It is possible to prevent the retransmission of the frame, and it is possible to improve the transmission efficiency between the base station control device and the data terminal.

According to the second invention, a frame is transmitted to the base station controller 2 and the base station controller 2 notifies the base station controller 2 that a transmission error has occurred, and attempts to retransmit the error frame in which the transmission error occurred. By adding a state of preferentially granting the transmission right to the mobile station to the collision control bit field of the downlink radio packet channel for notifying the state of the uplink radio packet channel from the radio base station, the base station controller 2 The base station controller 2 can receive the error frame before the timer for detecting the non-reception of the retransmission-requested error frame has timed out. Can be prevented from being discarded by the base station controller 2, and as a result, An effect that transmission efficiency becomes possible to improve the between the end 5.

Further, according to the third invention, the base station instructs the mobile station to preferentially transmit a frame that the base station control device expects to receive first, thereby enabling transmission. Since transmission from another mobile station is restricted, it is possible to reduce collisions in a wireless section, and it is possible to preferentially relay a frame that the base station control device desires to receive. .

According to the fourth aspect of the present invention, the mobile station identifies the type of transmittable frame notified from the base station so that the mobile station can transmit a frame to be transmitted or not. Alternatively, since the mobile device itself controls whether to wait, a frame from another mobile device in the wireless section is compared with a case where the mobile station transmits a frame to the wireless section without identifying the type of frame that can be transmitted. Therefore, it is possible to reduce the collision with the wireless communication and improve the throughput in the wireless section.

According to the fifth aspect of the present invention, when a mobile station performs a handover during transmission of a frame, the mobile station is connected to the mobile station via a radio base station connected before the execution of the handover. As a response to the frame transmitted from the data terminal to the base station controller,
Since the base station controller transmits an acknowledgment to the data terminal via the handover destination radio base station, the mobile station responds to the frame transmitted from the data terminal to the base station controller before the handover is performed. Since the data terminal can receive the acknowledgment transmitted from the base station controller to the data terminal, the data terminal can prevent a situation in which the acknowledgment from the base station controller is not received. As a result, it is possible to prevent retransmission of a frame normally transmitted from the data terminal to the base station control device, and thus it is possible to improve the transmission efficiency of the entire communication.

According to the sixth aspect, the collision control bit field of the downlink radio packet channel is extended, and the type of frame requested to be transmitted is set to Resend Req.
By specifying in the / Ack Req field and the mobile station that is requested to transmit a frame by the PS-ID, the base station controller sets the most strict time required for the activated timer to time out. Transmission priority can be given to the data terminals connected to the mobile terminal, collisions due to retransmission requests from a plurality of mobile stations and acquisition of priority due to acknowledgment requests can be prevented, and overall communication can be prevented. In this case, the transmission efficiency can be further improved.

Further, according to the seventh invention, when it is detected that the mobile station to which the radio base station has given the transmission right is different from the mobile station to which the retransmission request is issued from the base station control device, The base station activates the mobile station that is performing intermittent reception, and then sets the “limit state”, “retransmission request”, and “mobile station giving transmission right” to the collision detection bit of the downlink radio packet channel, and Since the transmission right is preferentially given to the mobile station that is performing intermittent reception, the transmission right can be efficiently given to the mobile station that is performing intermittent reception and that is the target of the retransmission request.

Further, according to the eighth invention, even when another mobile device different from the target of the acknowledgment transmission request or the retransmission request from the base station controller uses the uplink radio packet channel, The transmission of the frame from the other mobile station is interrupted, and the transmission confirmation, or, the transmission right is preferentially given to the mobile station targeted for the retransmission request. It is possible to prevent a situation in which a frame is retransmitted to the mobile device or a frame normally received from the mobile device is discarded due to a non-retransmission request frame being received, thereby improving the transmission efficiency of the entire communication. This has the effect of becoming

According to the ninth aspect, when the uplink radio channel is being used by another mobile station, the radio base station retransmits a frame for which an acknowledgment request or an error has been detected on the downlink radio channel. Notify the requesting mobile station of another unused uplink radio channel, and transmit an acknowledgment to the mobile station using the unused uplink radio channel, or detect an error. Since the retransmission of the transmitted frame is permitted, the retransmission of the mobile device or the transmission of the acknowledgment can be performed without interrupting the transmission of the mobile device during the frame transmission, so that the transmission efficiency of the entire communication is improved. .

Further, according to the tenth aspect, the radio base station that has received the retransmission request or the acknowledgment request from the base station controller transmits the retransmission request or the acknowledgment request to the mobile station that is the target of the retransmission request or the acknowledgment request. When it is detected that there is no uplink radio packet channel to be assigned to the base station, the base station controller is notified of the RNR (unreceivable) instead of the mobile station, and receives the RNR (unreceivable) from the radio base station. The base station control device that has acknowledged the delivery or determines that the mobile station that has requested retransmission cannot obtain the transmission right of the uplink wireless packet channel, detects the non-reception of the delivery confirmation, or detects the non-reception of the retransmission frame. Stop the timer, perform a fixed delay, and again request the radio base station for a delivery confirmation request,
Alternatively, since the retransmission request is transmitted, the transmission of the frame normally transmitted from the base station control device to the data terminal due to the timeout of the timer for detecting the non-reception of the delivery confirmation or the non-reception of the retransmission frame, and the data terminal Thus, it is possible to prevent the frame normally transmitted to the base station control device from being discarded, thereby improving the transmission efficiency of the entire communication.

According to the eleventh aspect, by assigning a priority to the mobile station, the radio base station can receive the retransmission request or the acknowledgment request from the base station controller. And the state of the uplink radio packet channel managed by the radio base station itself, and the priority of the mobile station transmitting a frame using the uplink radio packet channel, so that the uplink radio packet channel is given priority to which mobile station. By controlling whether or not to allocate, it is possible to perform communication preferentially according to the priority of the mobile device.

According to the twelfth aspect, when the uplink radio packet channel is in the idle state, the mobile station transmits a new frame at the timing of a retransmission request or delivery confirmation notified from the base station controller. Therefore, the mobile station can transmit without requesting the transmission right. Therefore, it is possible to reduce the number of random accesses by the mobile station and prevent collision of transmission right acquisition requests. It works. Also, when the transmission of another mobile station using the uplink radio packet channel is interrupted and the transmission right is given to the mobile station targeted for the retransmission request or the acknowledgment request, a newly transmitted frame is transmitted. Even if it exists, the transmission of the retransmission frame or the transmission of only the acknowledgment is permitted without transmitting the new frame, so that the transmission of the frame of the mobile station whose transmission has been interrupted can be promptly restarted. It works.

According to the thirteenth aspect, transmission of another mobile station using the uplink radio packet channel is interrupted, and the transmission right is given to the mobile station which is the target of the retransmission request or the delivery confirmation request. In the case of giving, a retransmission request from the base station control device, or in a data terminal connected to the mobile station targeted for the acknowledgment request, if there is a frame to be newly transmitted, the transmission is interrupted. Depending on the priority of the mobile station and the mobile station subject to the retransmission request or acknowledgment request, a frame to be newly transmitted is allowed to be transmitted together with a retransmission frame or acknowledgment, or a retransmission frame or transmission Since it is controlled whether to transmit only the confirmation, it is possible to preferentially perform communication according to the priority of the mobile device.

Further, according to the fourteenth aspect, each state depends on the state of the uplink radio packet channel and the type of transmission frame permitted when the transmission right is preferentially given to another mobile station. By performing random or constant delay within the range of the optimum upper limit value for each, it is possible to terminate the delay of the mobile station waiting for the transmission right in accordance with the change in the state of the uplink wireless packet channel. ,
There is an effect that the mobile station can efficiently acquire the transmission right of the uplink wireless packet channel.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing one embodiment of a wireless packet access method according to the present invention.

FIG. 2 shows a MAC (Media) of the mobile device 4 shown in FIG.
Access Control) and MA of the wireless base station 3
C from a frame (hereinafter, referred to as a MAC frame) transmitted / received wirelessly to the data terminal 5 by LLC (Logical).
Link Control) and the LL of the base station controller 2
FIG. 7 is an explanatory diagram showing an example of format conversion when conversion to a frame transmitted and received by C (hereinafter referred to as an LLC frame) or its inverse conversion is performed in the radio base station 3.

FIG. 3 shows a MAC performed in the mobile device 4 shown in FIG.
FIG. 4 is an explanatory diagram illustrating an example of format conversion between a frame and an LLC frame.

FIG. 4 is a MAC frame structure diagram showing a structure of an uplink MAC frame and a downlink MAC frame transmitted and received between a wireless base station 3 and a mobile device 4 in the wireless packet access scheme according to the first embodiment.

5 is a structural diagram showing an example of a collision control bit field shown in FIG. 4 when the radio base station 3 according to Embodiment 1 notifies a plurality of mobile stations 4 of a state of an uplink radio packet channel.

FIG. 6 is a block diagram illustrating the mobile devices 4a and 4b (including the terminals 5a and 5b), the radio base station 3, and the base station controller 2 according to the first embodiment.
FIG. 9 is a sequence diagram showing an operation sequence between the two.

FIG. 7 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention.

FIG. 8 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention.

FIG. 9 is a data structure diagram showing another embodiment of the wireless packet access method according to the present invention.

FIG. 10 is a data structure diagram showing another embodiment of the wireless packet access method according to the present invention.

FIG. 11 is a sequence diagram showing one embodiment of a wireless packet access method according to the present invention.

FIG. 12 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention.

FIG. 13 is a structural diagram showing a configuration of a collision control bit field of a downlink radio packet channel used in this embodiment.

FIG. 14 is a sequence diagram showing another embodiment of the wireless packet access method according to the present invention.

FIG. 15 is a flowchart showing another embodiment of the wireless packet access method according to the present invention.

FIG. 16 is a flowchart showing another embodiment of the wireless packet access method according to the present invention.

FIG. 17 shows a mobile device 4 according to the tenth embodiment, and
6 is a flowchart illustrating an operation flow of the data terminal 5.

FIG. 18 is a data structure diagram showing a structure of a collision control bit field of a downlink radio packet channel according to the tenth embodiment.

FIG. 19 is a flowchart showing another embodiment of the radio channel access method according to the present invention.

FIG. 20 is a flowchart showing another embodiment of the wireless packet access method according to the present invention.

FIG. 21 shows a format of a downlink signal from a wireless base station to a mobile station in communication by ICMA-PE of a conventional example.

FIG. 22 shows a format of an uplink signal in communication by ICMA-PE of a conventional example.

FIG. 23 is a flowchart showing an operation of a wireless base station in communication by the conventional ICMA-PE.

FIG. 24 is a flowchart showing an operation of the mobile device in communication by the conventional ICMA-PE.

FIG. 25 is a signal transmission time chart between a radio base station and a mobile device in a conventional example.

[Explanation of symbols]

 Reference Signs List 1 LAN 2 base station controller 3 radio base station 4 mobile device 5 data terminal 6 existing terminal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04L 12/56 (72) Inventor Koji Matsuyama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (14)

[Claims] 1. A base station controller having a data transport control and a route selection function in a wireless communication network, and a signal controlled by the base station controller and including a collision control bit field for controlling a state of an uplink wireless packet channel. A plurality of radio base stations outputting on a downlink radio channel, a plurality of mobile stations for establishing a radio communication link with the base station controller and the radio base station and performing packet communication in a multi-channel access format; When the base station control device transmits a data frame to any of the mobile stations, and expects a delivery confirmation of the data frame, the wireless communication system is used in a mobile communication system including The base station controls the collision control bit field to permit transmission only to the mobile station that has transmitted the data frame. A wireless packet access method. 2. A base station controller having a data transfer control and a path selection function in a wireless communication network, and a signal controlled by the base station controller and including a collision control bit field for controlling a state of an uplink wireless packet channel. A plurality of radio base stations that output
A mobile communication system comprising: a plurality of mobile stations for establishing a radio communication link with the base station controller and the radio base station to perform packet communication in a multi-channel access format; and a data terminal connected to the mobile station. When the base station controller detects an error in a data frame transmitted from the mobile station and requests retransmission of the frame, the radio base station controls the collision control bit field to perform retransmission. A wireless packet access method characterized in that transmission is permitted only to a mobile station that needs to perform the transmission. 3. When the base station controller notifies the base station controller of a delivery confirmation request for a specific mobile station or a retransmission request for a frame in which an error has been detected, the radio base station transmits the request to the specific mobile station via a radio channel. The transmission of acknowledgment or retransmission of a frame in which an error is detected is permitted, and the acknowledgment or retransmission frame transmitted from the specific mobile station is received and relayed to the base station controller. A wireless packet access method according to claim 1 or claim 2. 4. When a mobile station is notified of a delivery confirmation request or a retransmission request for a frame in which an error has been detected from a base station controller via a radio base station, the mobile station transmits a frame in which delivery confirmation or an error has been detected. 3. The wireless packet access method according to claim 1, wherein a transmission confirmation frame or a frame requested to be retransmitted is transmitted according to the permission. 5. A mobile station performs a handover during communication of a data frame, and a base station controller requests a delivery confirmation to the mobile station that has performed the handover, or detects an error in a received frame, and When requesting retransmission of a frame, the base station control device permits transmission of acknowledgment or retransmission of the frame from the radio base station of the handover destination to the mobile station. A wireless packet access method according to claim 1 or claim 2. 6. The collision control bit field of the downlink radio packet channel includes an identifier of a mobile station, and the radio base station transmits the mobile station when a transmission confirmation request or a frame retransmission request for a specific mobile station becomes necessary. 3. The wireless packet access method according to claim 1, wherein the transmission right is given to only one specific mobile device by designating the identifier of the wireless packet. 7. Completion of reception of a frame from the base station controller or completion of transmission of the frame to the base station controller and detection of an acknowledgment request or an error for the mobile station in the intermittent reception mode When a frame retransmission request occurs, the radio base station notifies the mobile device of a delivery confirmation request, or a retransmission request of a frame in which the error has been detected, in accordance with the timing at which the mobile device is operating in intermittent reception. 7. The wireless packet access method according to claim 6, wherein the transmission of the acknowledgment or the retransmission of the frame in which the error is detected is permitted to the mobile device in accordance with the timing. 8. When the uplink radio channel is being used by another mobile station, the radio base station suspends the use of the channel by the other mobile station using the uplink radio channel, and confirms the delivery. Request, or acknowledgment of delivery to the mobile station that is the target of the
Or permit transmission of the frame in which the error is detected,
7. The transmission to the other mobile station, which has interrupted the use of the wireless channel, after transmission of a delivery confirmation from the mobile station or after retransmission of a frame in which an error is detected is completed. The wireless packet access method according to the above. 9. When the radio base station has a plurality of radio packet channels and the uplink radio channel is used by another mobile station, the radio base station transmits a delivery confirmation request on the downlink radio channel, or Notifying the mobile station targeted for the retransmission request of the frame in which the error has been detected of another unused uplink radio channel, and confirming delivery to the mobile station using the unused uplink radio channel. 7. The wireless packet access method according to claim 6, wherein the transmission of the packet or the retransmission of the frame in which the error is detected is permitted. 10. A radio base station which has received a delivery confirmation request transmitted from a base station control device or a retransmission request for a frame in which an error has been detected, when all uplink radio channels are being used by another mobile station, 7. The wireless packet access method according to claim 6, wherein a frame indicating that a frame cannot be received (congestion state) is returned to the base station controller. 11. The radio base station, when an uplink radio channel is used by another mobile station, transmits the other mobile station using the radio channel according to the priority added to the mobile station. Select whether to suspend the transmission, permit transmission on the channel, permit transmission on another unused radio packet channel, or return a frame indicating that frame reception is impossible (congestion state) to the base station controller. The wireless packet access method according to any one of claims 8, 9 and 10, wherein: 12. The radio base station, in response to a delivery confirmation request from the base station controller or a retransmission request for a frame in which an error has been detected, confirms the delivery confirmation to the mobile station if the radio packet channel is in an idle state. Instruct the transmission of a frame, or a retransmission request frame, permit transmission of data frames other than requested to mobile units and data terminals,
If the wireless packet channel is busy by another mobile station, a mobile station or a base station control device that attempts to transmit acknowledgment upon completion of transmission from another mobile station that is currently granting the transmission right A transmission error is notified from the mobile station and a state in which there is a restriction condition that gives a transmission right only to the mobile station that is going to retransmit the frame in which the error has occurred (hereinafter referred to as a limit state). 9. The transmission method according to claim 8, wherein the mobile station instructs the given mobile station to transmit only a delivery confirmation frame or a retransmission request frame, and does not permit transmission even if another data frame transmission request is issued from the data terminal.
The wireless packet access method according to claim 9. 13. The wireless base station, in response to a delivery confirmation request from the base station control device or a retransmission request for a frame in which an error has been detected, sets the priority of a mobile station that has already acquired the right to transmit a wireless packet channel. If it is higher or the same, it indicates the transmission of a frame of acknowledgment or only a retransmission request frame, and if the priority of the mobile station that has the transmission right of the wireless packet channel is lower, a frame of acknowledgment, or 13. The mobile station and the data terminal are permitted to transmit a retransmission request frame and a data frame other than the requested data frame together. The wireless packet access method according to any one of the above. 14. The mobile station, when trying to acquire a transmission right of an uplink wireless packet channel in response to a data transmission request from a data terminal, states of an uplink wireless packet channel,
14. The wireless packet access method according to claim 13, wherein a random delay or a fixed delay is performed with an upper limit being a value according to a type of a frame transmitted in an uplink wireless packet channel.